{$CLASS Base1}
    {$MAIN}
        gl_FragColor.r = 1.0;
    {$END}
{$END}

{$CLASS Base2}
    {$MAIN}
        gl_FragColor.g = 1.0;
    {$END}
{$END}

{$CLASS SimpleClass $EXTENDS Base1 Base2}
    {$MAIN}
        {$INHERITED Base1};
        {$INHERITED Base2};
        gl_FragColor.ba = vec2(1.0);
    {$END}
{$END}